Hi guys.
Long time lurker, first time poster.

I trade on OptionsXpress.
General question:
Can I finance a debit call spread with a credit put spread in the same trade?
For example, FFIV for Jan 18 expiry:
Debit call spread 160/170: Debit 5.60
Credit put spread 130/120: Credit 2.30
Net debit for the whole trade: 3.30
The whole idea of selling a 130 put is to reduce the cost of the debit call spread. Since I'm unwilling to take the risk of a naked put, I'm capping the downside by buying the 120 put. Hence, the credit put spread.
Question 1:
Is this a valid approach?
Question 2:
I can set the put spread up for earlier expiry, Oct 17 for example.
Is this still valid?
Thanks guys.